<template>
  <view>
    <slot v-if="!nodes.length"/>
    <!--#ifdef APP-PLUS-NVUE-->
    <web-view id="top" ref="web" :style="'margin-top:-2px;height:'+height+'px'" @onPostMessage="_message"/>
    <!--#endif-->
    <!--#ifndef APP-PLUS-NVUE-->
    <view id="top" :style="showAm+(selectable?';user-select:text;-webkit-user-select:text':'')">
      <!--#ifdef H5 || MP-360-->
      <div :id="'rtf'+uid"></div>
      <!--#endif-->
      <!--#ifndef H5 || MP-360-->
      <trees :nodes="nodes" :lazyLoad="lazyLoad" :loading="loadingImg"/>
      <!--#endif-->
    </view>
    <!--#endif-->
  </view>
</template>

<script>
// #ifndef H5 || APP-PLUS-NVUE || MP-360
import trees from './libs/trees';

var cache = {},
    // #ifdef MP-WEIXIN || MP-TOUTIAO
    fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null,
    // #endif
    Parser = require('./libs/MpHtmlParser.js');
var dom;

// 计算 cache 的 key
function hash(str) {
  for (var i = str.length, val = 5381; i--;)
    val += (val << 5) + str.charCodeAt(i);
  return val;
}

// #endif
// #ifdef H5 || APP-PLUS-NVUE || MP-360
var rpx = uni.getSystemInfoSync().windowWidth / 750,
    cfg = require('./libs/config.js');
// #endif
// #ifdef APP-PLUS-NVUE
var weexDom = weex.requireModule('dom');
// #endif
/**
 * Parser 富文本组件
 * @tutorial https://github.com/jin-yufeng/Parser
 * @property {String|Array} html 富文本数据
 * @property {Boolean} autopause 是否在播放一个视频时自动暂停其他视频
 * @property {Boolean} autoscroll 是否自动给所有表格添加一个滚动层
 * @property {Boolean} autosetTitle 是否自动将 title 标签中的内容设置到页面标题
 * @property {Number} compress 压缩等级
 * @property {String} domain 图片、视频等链接的主域名
 * @property {Boolean} lazyLoad 是否开启图片懒加载
 * @property {String} loadingImg 图片加载完成前的占位图
 * @property {Boolean} selectable 是否开启长按复制
 * @property {Object} tagStyle 标签的默认样式
 * @property {Boolean} showWithAnimation 是否使用渐显动画
 * @property {Boolean} useAnchor 是否使用锚点
 * @property {Boolean} useCache 是否缓存解析结果
 * @event {Function} parse 解析完成事件
 * @event {Function} load dom 加载完成事件
 * @event {Function} ready 所有图片加载完毕事件
 * @event {Function} error 错误事件
 * @event {Function} imgtap 图片点击事件
 * @event {Function} linkpress 链接点击事件
 * @example <jyf-parser :html="html"></jyf-parser>
 * @author JinYufeng
 * @version 20200528
 * @listens MIT
 */
export default {
  name: 'parser',
  data() {
    return {
      // #ifdef H5 || MP-360
      uid: this._uid,
      // #endif
      // #ifdef APP-PLUS-NVUE
      height: 1,
      // #endif
      // #ifndef APP-PLUS-NVUE
      showAm: '',
      // #endif
      nodes: []
    }
  },
  // #ifndef H5 || APP-PLUS-NVUE || MP-360
  components: {
    trees
  },
  // #endif
  props: {
    html: null,
    autopause: {
      type: Boolean,
      default: true
    },
    autoscroll: Boolean,
    autosetTitle: {
      type: Boolean,
      default: true
    },
    // #ifndef H5 || APP-PLUS-NVUE || MP-360
    compress: Number,
    loadingImg: String,
    useCache: Boolean,
    // #endif
    domain: String,
    lazyLoad: Boolean,
    selectable: Boolean,
    tagStyle: Object,
    showWithAnimation: Boolean,
    useAnchor: Boolean
  },
  watch: {
    html(html) {
      this.setContent(html);
    }
  },
  mounted() {
    // 图片数组
    this.imgList = [];
    this.imgList.each = function (f) {
      for (var i = 0, len = this.length; i < len; i++)
        this.setItem(i, f(this[i], i, this));
    }
    this.imgList.setItem = function (i, src) {
      if (i == void 0 || !src) return;
      // #ifndef MP-ALIPAY || APP-PLUS
      // 去重
      if (src.indexOf('http') == 0 && this.includes(src)) {
        var newSrc = '';
        for (var j = 0, c; c = src[j]; j++) {
          if (c == '/' && src[j - 1] != '/' && src[j + 1] != '/') break;
          newSrc += Math.random() > 0.5 ? c.toUpperCase() : c;
        }
        newSrc += src.substr(j);
        return this[i] = newSrc;
      }
      // #endif
      this[i] = src;
      // 暂存 data src
      if (src.includes('data:image')) {
        var filePath, info = src.match(/data:image\/(\S+?);(\S+?),(.+)/);
        if (!info) return;
        // #ifdef MP-WEIXIN || MP-TOUTIAO
        filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
        fs && fs.writeFile({
          filePath,
          data: info[3],
          encoding: info[2],
          success: () => this[i] = filePath
        })
        // #endif
        // #ifdef APP-PLUS
        filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`;
        var bitmap = new plus.nativeObj.Bitmap();
        bitmap.loadBase64Data(src, () => {
          bitmap.save(filePath, {}, () => {
            bitmap.clear()
            this[i] = filePath;
          })
        })
        // #endif
      }
    }
    // #ifdef H5 || MP-360
    this.document = document.getElementById('rtf' + this._uid);
    // #endif
    // #ifndef H5 || APP-PLUS-NVUE || MP-360
    if (dom) this.document = new dom(this);
    // #endif
    // #ifdef APP-PLUS-NVUE
    this.document = this.$refs.web;
    setTimeout(() => {
      // #endif
      if (this.html) this.setContent(this.html);
      // #ifdef APP-PLUS-NVUE
    }, 30)
    // #endif
  },
  beforeDestroy() {
    // #ifdef H5 || MP-360
    if (this._observer) this._observer.disconnect();
    // #endif
    this.imgList.each(src => {
      // #ifdef APP-PLUS
      if (src && src.includes('_doc')) {
        plus.io.resolveLocalFileSystemURL(src, entry => {
          entry.remove();
        });
      }
      // #endif
      // #ifdef MP-WEIXIN || MP-TOUTIAO
      if (src && src.includes(uni.env.USER_DATA_PATH))
        fs && fs.unlink({
          filePath: src
        })
      // #endif
    })
    clearInterval(this._timer);
  },
  methods: {
    // #ifdef H5 || APP-PLUS-NVUE || MP-360
    _Dom2Str(nodes) {
      var str = '';
      for (var node of nodes) {
        if (node.type == 'text')
          str += node.text;
        else {
          str += ('<' + node.name);
          for (var attr in node.attrs || {})
            str += (' ' + attr + '="' + node.attrs[attr] + '"');
          if (!node.children || !node.children.length) str += '>';
          else str += ('>' + this._Dom2Str(node.children) + '</' + node.name + '>');
        }
      }
      return str;
    },
    _handleHtml(html, append) {
      if (typeof html != 'string') html = this._Dom2Str(html.nodes || html);
      if (!append) {
        // 处理 tag-style 和 userAgentStyles
        var style = '<style>@keyframes show{0%{opacity:0}100%{opacity:1}}img{max-width:100%}';
        for (var item in cfg.userAgentStyles)
          style += `${item}{${cfg.userAgentStyles[item]}}`;
        for (item in this.tagStyle)
          style += `${item}{${this.tagStyle[item]}}`;
        style += '</style>';
        html = style + html;
      }
      // 处理 rpx
      if (html.includes('rpx'))
        html = html.replace(/[0-9.]+\s*rpx/g, $ => parseFloat($) * rpx + 'px');
      return html;
    },
    // #endif
    setContent(html, append) {
      // #ifdef APP-PLUS-NVUE
      if (!html)
        return this.height = 1;
      if (append)
        this.$refs.web.evalJs("var b=document.createElement('div');b.innerHTML='" + html.replace(/'/g, "\\'") +
            "';document.getElementById('parser').appendChild(b)");
      else {
        html =
            '<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"><base href="' +
            this.domain + '"><div id="parser"' + (this.selectable ? '>' : ' style="user-select:none">') + this._handleHtml(html).replace(/\n/g, '\\n') +
            '</div><script>"use strict";function e(e){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[e]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}' +
            (this.showWithAnimation ? 'document.body.style.animation="show .5s",' : '') +
            'setTimeout(function(){e({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight+16})},50);\x3c/script>';
        this.$refs.web.evalJs("document.write('" + html.replace(/'/g, "\\'") + "');document.close()");
      }
      this.$refs.web.evalJs(
          'var t=document.getElementsByTagName("title");t.length&&e({action:"getTitle",title:t[0].innerText});for(var o,n=document.getElementsByTagName("style"),r=0;o=n[r++];)o.innerHTML=o.innerHTML.replace(/body/g,"#parser");for(var i,a=document.getElementsByTagName("img"),s=[],c=0,l=0;i=a[c];c++)i.onerror=function(){' +
          (cfg.errorImg ? 'this.src="' + cfg.errorImg + '",' : '') +
          'e({action:"error",source:"img",target:this})},i.hasAttribute("ignore")||"A"==i.parentElement.nodeName||(i.i=l++,s.push(i.src),i.onclick=function(){e({action:"preview",img:{i:this.i,src:this.src}})});e({action:"getImgList",imgList:s});for(var d,u=document.getElementsByTagName("a"),g=0;d=u[g];g++)d.onclick=function(){var t,o=this.getAttribute("href");if("#"==o[0]){var n=document.getElementById(o.substr(1));n&&(t=n.offsetTop)}return e({action:"linkpress",href:o,offset:t}),!1};for(var m,f=document.getElementsByTagName("video"),h=0;m=f[h];h++)m.style.maxWidth="100%",m.onerror=function(){e({action:"error",source:"video",target:this})}' +
          (this.autopause ? ',m.onplay=function(){for(var e,t=0;e=f[t];t++)e!=this&&e.pause()}' : '') +
          ';for(var v,y=document.getElementsByTagName("audio"),_=0;v=y[_];_++)v.onerror=function(){e({action:"error",source:"audio",target:this})};' +
          (this.autoscroll ? 'for(var p,w=document.getElementsByTagName("table"),T=0;p=w[T];T++){var E=document.createElement("div");E.style.overflow="scroll",p.parentNode.replaceChild(E,p),E.appendChild(p)}' : '') +
          '(function(){return new Promise(function(e){var t=document.getElementById("parser"),o=t.scrollHeight,n=setInterval(function(){o==t.scrollHeight?(clearInterval(n),e(o)):o=t.scrollHeight},500)})})().then(function(t){e({action:"ready",height:t+16})})'
      )
      this.nodes = [1];
      // #endif
      // #ifdef H5 || MP-360
      if (!html) {
        if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf);
        return;
      }
      var div = document.createElement('div');
      if (!append) {
        if (this.rtf) this.rtf.parentNode.removeChild(this.rtf);
        this.rtf = div;
      } else {
        if (!this.rtf) this.rtf = div;
        else this.rtf.appendChild(div);
      }
      div.innerHTML = this._handleHtml(html, append);
      for (var styles = this.rtf.getElementsByTagName('style'), i = 0, style; style = styles[i++];) {
        style.innerHTML = style.innerHTML.replace(/body/g, '#rtf' + this._uid);
        style.setAttribute('scoped', 'true');
      }
      // 懒加载
      if (!this._observer && this.lazyLoad && IntersectionObserver) {
        this._observer = new IntersectionObserver(changes => {
          for (let item, i = 0; item = changes[i++];) {
            if (item.isIntersecting) {
              item.target.src = item.target.getAttribute('data-src');
              item.target.removeAttribute('data-src');
              this._observer.unobserve(item.target);
            }
          }
        }, {
          rootMargin: '500px 0px 500px 0px'
        })
      }
      var _ts = this;
      // 获取标题
      var title = this.rtf.getElementsByTagName('title');
      if (title.length && this.autosetTitle)
        uni.setNavigationBarTitle({
          title: title[0].innerText
        })
      // 图片处理
      this.imgList.length = 0;
      var imgs = this.rtf.getElementsByTagName('img');
      for (let i = 0, j = 0, img; img = imgs[i]; i++) {
        var src = img.getAttribute('src');
        if (this.domain && src) {
          if (src[0] == '/') {
            if (src[1] == '/')
              img.src = (this.domain.includes('://') ? this.domain.split('://')[0] : '') + ':' + src;
            else img.src = this.domain + src;
          } else if (!src.includes('://')) img.src = this.domain + '/' + src;
        }
        if (!img.hasAttribute('ignore') && img.parentElement.nodeName != 'A') {
          img.i = j++;
          _ts.imgList.push(img.src || img.getAttribute('data-src'));
          img.onclick = function () {
            var preview = true;
            this.ignore = () => preview = false;
            _ts.$emit('imgtap', this);
            if (preview) {
              uni.previewImage({
                current: this.i,
                urls: _ts.imgList
              });
            }
          }
        }
        img.onerror = function () {
          if (cfg.errorImg)
            _ts.imgList[this.i] = this.src = cfg.errorImg;
          _ts.$emit('error', {
            source: 'img',
            target: this
          });
        }
        if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
          img.setAttribute('data-src', img.src);
          img.removeAttribute('src');
          this._observer.observe(img);
        }
      }
      // 链接处理
      var links = this.rtf.getElementsByTagName('a');
      for (var link of links) {
        link.onclick = function () {
          var jump = true,
              href = this.getAttribute('href');
          _ts.$emit('linkpress', {
            href,
            ignore: () => jump = false
          });
          if (jump && href) {
            if (href[0] == '#') {
              if (_ts.useAnchor) {
                _ts.navigateTo({
                  id: href.substr(1)
                })
              }
            } else if (href.indexOf('http') == 0 || href.indexOf('//') == 0)
              return true;
            else
              uni.navigateTo({
                url: href
              })
          }
          return false;
        }
      }
      // 视频处理
      var videos = this.rtf.getElementsByTagName('video');
      _ts.videoContexts = videos;
      for (let video, i = 0; video = videos[i++];) {
        video.style.maxWidth = '100%';
        video.onerror = function () {
          _ts.$emit('error', {
            source: 'video',
            target: this
          });
        }
        video.onplay = function () {
          if (_ts.autopause)
            for (let item, i = 0; item = _ts.videoContexts[i++];)
              if (item != this) item.pause();
        }
      }
      // 音频处理
      var audios = this.rtf.getElementsByTagName('audio');
      for (var audio of audios)
        audio.onerror = function () {
          _ts.$emit('error', {
            source: 'audio',
            target: this
          });
        }
      // 表格处理
      if (this.autoscroll) {
        var tables = this.rtf.getElementsByTagName('table');
        for (var table of tables) {
          let div = document.createElement('div');
          div.style.overflow = 'scroll';
          table.parentNode.replaceChild(div, table);
          div.appendChild(table);
        }
      }
      if (!append) this.document.appendChild(this.rtf);
      this.$nextTick(() => {
        this.nodes = [1];
        this.$emit('load');
      });
      setTimeout(() => this.showAm = '', 500);
      // #endif
      // #ifndef APP-PLUS-NVUE
      // #ifndef H5 || MP-360
      var nodes;
      if (!html)
        return this.nodes = [];
      else if (typeof html == 'string') {
        let parser = new Parser(html, this);
        // 缓存读取
        if (this.useCache) {
          var hashVal = hash(html);
          if (cache[hashVal])
            nodes = cache[hashVal];
          else {
            nodes = parser.parse();
            cache[hashVal] = nodes;
          }
        } else nodes = parser.parse();
        this.$emit('parse', nodes);
      } else if (Object.prototype.toString.call(html) == '[object Array]') {
        // 非本插件产生的 array 需要进行一些转换
        if (html.length && html[0].PoweredBy != 'Parser') {
          let parser = new Parser(html, this);
          (function f(ns) {
            for (var i = 0, n; n = ns[i]; i++) {
              if (n.type == 'text') continue;
              n.attrs = n.attrs || {};
              for (var item in n.attrs)
                if (typeof n.attrs[item] != 'string') n.attrs[item] = n.attrs[item].toString();
              parser.matchAttr(n, parser);
              if (n.children && n.children.length) {
                parser.STACK.push(n);
                f(n.children);
                parser.popNode(parser.STACK.pop());
              } else n.children = void 0;
            }
          })(html);
        }
        nodes = html;
      } else if (typeof html == 'object' && html.nodes) {
        nodes = html.nodes;
        console.warn('错误的 html 类型：object 类型已废弃');
      } else
        return console.warn('错误的 html 类型：' + typeof html);
      if (append) this.nodes = this.nodes.concat(nodes);
      else this.nodes = nodes;
      if (nodes.length && nodes[0].title && this.autosetTitle)
        uni.setNavigationBarTitle({
          title: nodes[0].title
        })
      if (this.imgList) this.imgList.length = 0;
      this.videoContexts = [];
      this.$nextTick(() => {
        this.$emit('load');
      })
      // #endif
      var height;
      clearInterval(this._timer);
      this._timer = setInterval(() => {
        // #ifdef H5 || MP-360
        this.rect = this.rtf.getBoundingClientRect();
        // #endif
        // #ifndef H5 || MP-360
        // #ifdef APP-PLUS
        uni.createSelectorQuery().in(this)
        // #endif
        // #ifndef APP-PLUS
        this.createSelectorQuery()
            // #endif
            .select('#top').boundingClientRect().exec(res => {
          if (!res) return;
          this.rect = res[0];
          // #endif
          if (this.rect.height == height) {
            this.$emit('ready', this.rect)
            clearInterval(this._timer);
          }
          height = this.rect.height;
          // #ifndef H5 || MP-360
        });
        // #endif
      }, 350);
      if (this.showWithAnimation && !append) this.showAm = 'animation:show .5s';
      // #endif
    },
    getText(ns = this.nodes) {
      var txt = '';
      // #ifdef APP-PLUS-NVUE
      txt = this._text;
      // #endif
      // #ifdef H5 || MP-360
      txt = this.rtf.innerText;
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE || MP-360
      for (var i = 0, n; n = ns[i++];) {
        if (n.type == 'text') txt += n.text.replace(/&nbsp;/g, '\u00A0').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
            .replace(/&amp;/g, '&');
        else if (n.type == 'br') txt += '\n';
        else {
          // 块级标签前后加换行
          var block = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n.name[1] >
              '0' && n.name[1] < '7');
          if (block && txt && txt[txt.length - 1] != '\n') txt += '\n';
          if (n.children) txt += this.getText(n.children);
          if (block && txt[txt.length - 1] != '\n') txt += '\n';
          else if (n.name == 'td' || n.name == 'th') txt += '\t';
        }
      }
      // #endif
      return txt;
    },
    navigateTo(obj) {
      if (!this.useAnchor)
        return obj.fail && obj.fail({
          errMsg: 'Anchor is disabled'
        })
      // #ifdef APP-PLUS-NVUE
      if (!obj.id)
        weexDom.scrollToElement(this.$refs.web);
      else
        this.$refs.web.evalJs('var pos=document.getElementById("' + obj.id +
            '");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' + (obj.offset || 0) + '})');
      obj.success && obj.success({
        errMsg: 'pageScrollTo:ok'
      });
      // #endif
      // #ifdef H5 || MP-360
      if (!obj.id) {
        window.scrollTo(0, this.rtf.offsetTop);
        return obj.success && obj.success({
          errMsg: 'pageScrollTo:ok'
        });
      }
      var target = document.getElementById(obj.id);
      if (!target) return obj.fail && obj.fail({
        errMsg: 'Label not found'
      });
      obj.scrollTop = this.rtf.offsetTop + target.offsetTop + (obj.offset || 0);
      uni.pageScrollTo(obj);
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE || MP-360
      var Scroll = (selector, component) => {
        uni.createSelectorQuery().in(component ? component : this).select(selector).boundingClientRect().selectViewport()
            .scrollOffset()
            .exec(res => {
              if (!res || !res[0])
                return obj.fail && obj.fail({
                  errMsg: 'Label not found'
                });
              obj.scrollTop = res[1].scrollTop + res[0].top + (obj.offset || 0);
              uni.pageScrollTo(obj);
            })
      }
      if (!obj.id) Scroll('#top');
      else {
        // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
        Scroll('#top >>> #' + obj.id + ', #top >>> .' + obj.id);
        // #endif
        // #ifdef MP-BAIDU || MP-ALIPAY || APP-PLUS
        for (var anchor of this.anchors)
          if (anchor.id == obj.id)
            Scroll('#' + obj.id + ', .' + obj.id, anchor.node);
        // #endif
      }
      // #endif
    },
    getVideoContext(id) {
      // #ifndef APP-PLUS-NVUE
      if (!id) return this.videoContexts;
      else
        for (var i = this.videoContexts.length; i--;)
          if (this.videoContexts[i].id == id) return this.videoContexts[i];
      // #endif
    },
    // #ifdef APP-PLUS-NVUE
    _message(e) {
      // 接收 web-view 消息
      var data = e.detail.data[0];
      if (data.action == 'load') {
        this.$emit('load');
        this.height = data.height;
        this._text = data.text;
      } else if (data.action == 'getTitle') {
        if (this.autosetTitle)
          uni.setNavigationBarTitle({
            title: data.title
          })
      } else if (data.action == 'getImgList') {
        this.imgList.length = 0;
        for (var i = data.imgList.length; i--;)
          this.imgList.setItem(i, data.imgList[i]);
      } else if (data.action == 'preview') {
        var preview = true;
        data.img.ignore = () => preview = false;
        this.$emit('imgtap', data.img);
        if (preview)
          uni.previewImage({
            current: data.img.i,
            urls: this.imgList
          })
      } else if (data.action == 'linkpress') {
        var jump = true,
            href = data.href;
        this.$emit('linkpress', {
          href,
          ignore: () => jump = false
        })
        if (jump && href) {
          if (href[0] == '#') {
            if (this.useAnchor)
              weexDom.scrollToElement(this.$refs.web, {
                offset: data.offset
              })
          } else if (href.includes('://'))
            plus.runtime.openWeb(href);
          else
            uni.navigateTo({
              url: href
            })
        }
      } else if (data.action == 'error') {
        if (data.source == 'img' && cfg.errorImg)
          this.imgList.setItem(data.target.i, cfg.errorImg);
        this.$emit('error', {
          source: data.source,
          target: data.target
        })
      } else if (data.action == 'ready') {
        this.height = data.height;
        this.$nextTick(() => {
          uni.createSelectorQuery().in(this).select('#top').boundingClientRect().exec(res => {
            this.rect = res[0];
            this.$emit('ready', res[0]);
          })
        })
      }
    },
    // #endif
  }
}
</script>

<style>
@keyframes show {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

/* #ifdef MP-WEIXIN */
:host {
  display: block;
  overflow: scroll;
  -webkit-overflow-scrolling: touch;
}

/* #endif */
</style>
